General > General Technical Chat
Review: Hantek DDS 3X25. Anyone own one?
Bored@Work:
Has someone seen a Linux driver for that thing, or at least some project where the USB interface is reverse-engineered?
saturation:
It has to be seen in video. 10/10 terrific job, mecha! You're done to Hantek what eevblog has done to Rigol 1052e.
Mechatrommer:
:D :D :D man! i didnt expect it will be on video. and pls dont exagerate pal, its embarassing, i kind of over flattered, but thanx for the video effort. but i still dissapointed you didnt mention that now 3x25 support sawtooth wave :P nevermind its 100% ok. there is no magic in it, just a simple "remainder theorem" i think. and all rectification are done in software. several thing i want to point out...
1) the glitch and irregularity in "square synch out" is the property of the hardware, i've done nothing to repair it. its just automatic, and from my observation, "square synch" irregularity is affected by signal shape and phase just as shown in pictures below (note the notches location on square)
2) i made different 50ohm BNC cable and now i can read both signal at terminated setting (my previous pictures showed non terminated signal, but terminated synch output). with different cable and termination setup, my phase calibration no longer works. as also shown in the same pictures below (synch_vs_signal.jpg), by right they should be 0 degree phase shift, bt not anymore. so i think its the instability in the hardware, not much i can do. worst in highest freq range 100MHz, at 2 points per period, i will no longer able to shift between 0 and 180 degree. so its a bad news.
i would love to expand the software to include arbitrary point editing, to make it more flexible compared to hantek bundled software. but i think i need more vote on it since it will take much more time, and its still workable in the bundled software. i believe people like saturation will have no problem solving problem with the bundled hantek software. as for now, i still concentrate on how to (1) make the signal in-phase and (2) minimize signal attenuation by using some algorithm. about the former (1) since fom my test and observation... different cable setup and highly probably different circuit in real application will need different calibration value, so it will be difficult and i think we still need to look closely the "signal vs synch phase difference" during our real work.
and lastly, its not a genius work, its just a devotion to make a better thing and an appreciation on information sharing, so our one sleepless night will not just be benefited by us alone, but by many others and propagate throughout... Cheers.
Mechatrommer:
and lastly, but not least. this hantek can be made to work down to 0.5Hz (extended lower limit. capable 0.75, 0.63 and any decimal between sub 1Hz and 0.5Hz) the spec said only down to 1Hz, so another exploit. but the synch output only can go down to 1Hz, so less than 1Hz signal is not synched. in the little tool you can see less than 1Hz signal by entering the freq and disable the "Stable Synch / Jitter" option.
ps: if you found out something you stumbled (cannot do) with existing (bundled and the little tester) software. be glad to ring me a bell.
Mechatrommer:
fooling around with sub hz, i found interesting thing. the fpga tries its best to synch at any frequency by means of previously mentioned "dajones glitch" and "leap year effect". now we can study those in great stability at sub hz frequency as shown in the picture.
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